diff --git a/fs/lustre/include/lustre_net.h b/fs/lustre/include/lustre_net.h
index 78df59b..cf1bb7f 100644
--- a/fs/lustre/include/lustre_net.h
+++ b/fs/lustre/include/lustre_net.h
@@ -2010,7 +2010,7 @@ int lustre_shrink_msg(struct lustre_msg *msg, int segment,
 u32 lustre_msg_size(u32 magic, int count, u32 *lengths);
 u32 lustre_msg_size_v2(int count, u32 *lengths);
 u32 lustre_packed_msg_size(struct lustre_msg *msg);
-u32 lustre_msg_early_size(void);
+extern u32 lustre_msg_early_size;
 void *lustre_msg_buf_v2(struct lustre_msg_v2 *m, u32 n, u32 min_size);
 void *lustre_msg_buf(struct lustre_msg *m, u32 n, u32 minlen);
 u32 lustre_msg_buflen(struct lustre_msg *m, u32 n);
diff --git a/fs/lustre/mdc/mdc_locks.c b/fs/lustre/mdc/mdc_locks.c
index aba94d1..b86d1b9 100644
--- a/fs/lustre/mdc/mdc_locks.c
+++ b/fs/lustre/mdc/mdc_locks.c
@@ -397,7 +397,7 @@ static int mdc_save_lovea(struct ptlrpc_request *req, void *data, u32 size)
 
 	/* Get real repbuf allocated size as rounded up power of 2 */
 	repsize = size_roundup_power2(req->rq_replen +
-				      lustre_msg_early_size());
+				      lustre_msg_early_size);
 	/* Estimate free space for DoM files in repbuf */
 	repsize_estimate = repsize - (req->rq_replen -
 			   mdt_md_capsule_size +
@@ -415,7 +415,7 @@ static int mdc_save_lovea(struct ptlrpc_request *req, void *data, u32 size)
 		CDEBUG(D_INFO, "Increase repbuf by %d bytes, total: %d\n",
 		       repsize, req->rq_replen);
 		repsize = size_roundup_power2(req->rq_replen +
-					      lustre_msg_early_size());
+					      lustre_msg_early_size);
 	}
 	/* The only way to report real allocated repbuf size to the server
 	 * is the lm_repsize but it must be set prior buffer allocation itself
diff --git a/fs/lustre/ptlrpc/pack_generic.c b/fs/lustre/ptlrpc/pack_generic.c
index 23b36de..b41f51d 100644
--- a/fs/lustre/ptlrpc/pack_generic.c
+++ b/fs/lustre/ptlrpc/pack_generic.c
@@ -72,14 +72,16 @@ u32 lustre_msg_hdr_size(u32 magic, u32 count)
 	}
 }
 
+u32 lustre_msg_early_size;
+EXPORT_SYMBOL(lustre_msg_early_size);
+
 /* early reply size */
-u32 lustre_msg_early_size(void)
+void lustre_msg_early_size_init(void)
 {
 	u32 pblen = sizeof(struct ptlrpc_body);
 
-	return lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, &pblen);
+	lustre_msg_early_size = lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, &pblen);
 }
-EXPORT_SYMBOL(lustre_msg_early_size);
 
 u32 lustre_msg_size_v2(int count, u32 *lengths)
 {
diff --git a/fs/lustre/ptlrpc/ptlrpc_internal.h b/fs/lustre/ptlrpc/ptlrpc_internal.h
index f1f414c..d6edfde 100644
--- a/fs/lustre/ptlrpc/ptlrpc_internal.h
+++ b/fs/lustre/ptlrpc/ptlrpc_internal.h
@@ -244,6 +244,7 @@ void ptlrpc_fill_bulk_md(struct lnet_md *md, struct ptlrpc_bulk_desc *desc,
 struct ptlrpc_reply_state *
 lustre_get_emerg_rs(struct ptlrpc_service_part *svcpt);
 void lustre_put_emerg_rs(struct ptlrpc_reply_state *rs);
+void lustre_msg_early_size_init(void); /* just for init */
 
 /* pinger.c */
 int ptlrpc_start_pinger(void);
diff --git a/fs/lustre/ptlrpc/ptlrpc_module.c b/fs/lustre/ptlrpc/ptlrpc_module.c
index 8379bc4..7e29a91 100644
--- a/fs/lustre/ptlrpc/ptlrpc_module.c
+++ b/fs/lustre/ptlrpc/ptlrpc_module.c
@@ -85,6 +85,7 @@ static int __init ptlrpc_init(void)
 	mutex_init(&pinger_mutex);
 	mutex_init(&ptlrpcd_mutex);
 	ptlrpc_init_xid();
+	lustre_msg_early_size_init();
 
 	rc = libcfs_setup();
 	if (rc)
diff --git a/fs/lustre/ptlrpc/sec_null.c b/fs/lustre/ptlrpc/sec_null.c
index cf8f24b..a7241bd 100644
--- a/fs/lustre/ptlrpc/sec_null.c
+++ b/fs/lustre/ptlrpc/sec_null.c
@@ -195,7 +195,7 @@ int null_alloc_repbuf(struct ptlrpc_sec *sec,
 		      int msgsize)
 {
 	/* add space for early replied */
-	msgsize += lustre_msg_early_size();
+	msgsize += lustre_msg_early_size;
 
 	msgsize = size_roundup_power2(msgsize);
 
@@ -367,7 +367,7 @@ int null_authorize(struct ptlrpc_request *req)
 
 	if (likely(req->rq_packed_final)) {
 		if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
-			req->rq_reply_off = lustre_msg_early_size();
+			req->rq_reply_off = lustre_msg_early_size;
 	} else {
 		u32 cksum;
 
diff --git a/fs/lustre/ptlrpc/sec_plain.c b/fs/lustre/ptlrpc/sec_plain.c
index 0d1c591..d546722 100644
--- a/fs/lustre/ptlrpc/sec_plain.c
+++ b/fs/lustre/ptlrpc/sec_plain.c
@@ -996,7 +996,7 @@ int sptlrpc_plain_init(void)
 	u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 	int rc;
 
-	buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size();
+	buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size;
 	plain_at_offset = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 
 	rc = sptlrpc_register_policy(&plain_policy);
